Filter for filtering mutagens from an engine oil

Abstract

A filter ( 2 ) for filtering mutagens from an engine oil, which filter ( 2 ) comprises a body ( 4 ), an inlet ( 12 ) for oil passing into the body ( 4 ), an outlet ( 14 ) for the oil passing out of the body ( 4 ), and a filter ( 2 ) material in the body ( 4 ) for filtering the oil as the oil passes through the body ( 4 ), and the filter ( 2 ) material being such that it comprises activated carbon ( 16 ) for removing the mutagens.

1. A filter for filtering mutagens from an engine oil, which filter comprises a body, an inlet for oil passing into the body, an outlet for oil passing out of the body, and a filter material in the body for filtering the oil as the oil passes through the body, and the filter material being such that it comprises activated carbon for removing the mutagens and a retainer material for retaining the activated carbon in place, the activated carbon is activated particulate carbon, the activated carbon is separate from and not integrally formed with the retainer material, the activated carbon has substantially its entire surface available for contact with the oil, the retainer material is an absorbent material, and the retainer material is in the form of a plurality of radially extending adjacent layers or pieces with the activated carbon between the layers or pieces wherein the activated carbon extends radially to a depth defined by the layers or pieces. 
     
     
       2. A filter according to  claim 1  in which the activated carbon is 44 micron activated carbon. 
     
     
       3. A filter according to  claim 1  in which the retainer material is a woven foam material. 
     
     
       4. A filter according to  claim 1  in which the retainer material is a polymer foam material. 
     
     
       5. A filter accordingly to  claim 1  in which the retainer material is an absorbent fibre material. 
     
     
       6. A filter according to  claim 5  in which the absorbent fibre material is a polyacrylate super absorbent fibre material. 
     
     
       7. A filter according to  claim 5  in which the absorbent fibre material is in the form of a non-woven material, a yarn material or a woven material. 
     
     
       8. A filter according to  claim 1  in which the filter material forms part of a cartridge which is positioned in the body. 
     
     
       9. A filter according to  claim 8  in which the cartridge includes a support member for the filter material. 
     
     
       10. A filter according to  claim 9  in which the support member has a plurality of apertures along its length for enabling the oil to pass through the support member. 
     
     
       11. A filter according to  claim 9  in which the filter material is positioned around the outside of the support member. 
     
     
       12. A filter according to  claim 11  in which the filter material is in sheet form and is wrapped around the outside of the support member. 
     
     
       13. A filter according to  claim 9  in which the filter material is positioned inside the support member. 
     
     
       14. A filter according to  claim 13  in which the filter material is in sheet form or is the form of pieces. 
     
     
       15. A filter according to  claim 14  and including end screen members for retaining the filter material in the support member. 
     
     
       16. A filter according to  claim 1  and including a non-return valve. 
     
     
       17. A filter according to  claim 16  in which the non-return valve is positioned in an end part of the filter. 
     
     
       18. A filter according to  claim 1  in which the outlet is an internally threaded outlet for enabling the filter to be a screw threaded connection to an oil circuit.